Fix intersect bug in get-changeset-arguments.sh

Author: dskloetc

.github/scripts/get-changeset-arguments.sh

@@ -34,6 +34,8 @@ intersect() {
 
 add_changed_reverse_package_deps() {
   packages="$1"
+  # Keep the existing packages.
+  echo "$packages"
   # We need to include reverse dependencies because if a dependency is
   # bumped, this also results in a patch bump of the dependent package.
   # But if the dependency is not actually changed (either directly or